[ 1182.170154][T10989] Could not find device with ifindex 2000 in netnsfd 11
[ 1182.170833][T10989] Could not find netns with fd: 2000
[ 1182.171425][T10989] Cannot link a netdevsim to itself
[ 1182.172120][T10989] Format for linking two devices is "netnsfd_a:ifidx_a netnsfd_b:ifidx_b" (int uint int uint).